This way, key bindings 'Mod-B', 'Mod-I' and 'Mod-U' with active caps
lock have the same effect as their lowercase siblings.
Prosemirror examples did the same, see ProseMirror/prosemirror#895
Fixes: #2426
Signed-off-by: Jonas <jonas@freesources.org>
* add new addOptions option
* replace defaultOptions with addOptions for all extensions
* replace defaultOptions with addOptions for all demos
* replace defaultOptions with addOptions in docs
* refactoring
* refactoring
* drop object support for addOptions
* fix optional options
* fix tests